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Intel Lab Diagnostics Dubai
Single Biomarker

Alanine Aminotransferase (ALT/SGPT)

Liver Enzyme (ALT / SGPT)

ALT is a liver enzyme that is released into the blood when liver cells are damaged. This test helps detect liver inflammation or injury from hepatitis, medications, or fatty liver disease.

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  • Physician-reviewed report

24 Hours

Turnaround

Blood

Sample

About This Test

What the Alanine Aminotransferase (ALT/SGPT) test tells you

Alanine aminotransferase, still often written as SGPT, is an enzyme that lives inside liver cells and does its work there. Very little of it belongs in the bloodstream. When liver cells are inflamed, stressed or dying, their contents leak out, and ALT is one of the first things a blood test picks up. That is why it is included in almost every routine health screen: it is a sensitive early signal that something is irritating the liver, often long before you would feel anything.

ALT is the more liver-specific of the two classic transaminases, which is why doctors pay close attention when it rises on its own. The common explanations in adults are metabolic fatty liver disease linked to weight, blood sugar and lipids; alcohol; viral hepatitis; and medicines or supplements, a category that includes prescription drugs as well as herbal remedies and bodybuilding products. Less often, autoimmune liver disease, iron overload, coeliac disease or a thyroid disorder is behind it.

A single raised value is a starting point rather than a conclusion. The number can move with a hard gym session, a heavy weekend, a new medicine or a passing viral illness, so your doctor will usually repeat it before investigating further. What matters most is the pattern over time and the company it keeps: how ALT sits relative to AST, whether the bile duct enzymes are also up, and whether the liver's synthetic markers such as albumin remain intact. Persistent elevation is what prompts a fuller look for a cause.

Sample type
Blood
Turnaround
24 Hours
Fasting
Not required
Best for
Adults & teens
Why Get Tested?

Recommended as a routine liver health screen, when you take medications that may affect the liver, or when symptoms such as jaundice, fatigue, or abdominal pain suggest liver involvement.

  • Detect silent liver injury

    Liver inflammation is usually painless in its early stages, and ALT can flag it while there is still time to reverse the cause.

  • Monitor medication safety

    Several common medicines can irritate the liver, and periodic ALT checks are the standard way to catch that before it becomes a problem.

  • Track fatty liver over time

    In metabolic fatty liver disease, ALT is one of the simplest ways to see whether weight, diet and activity changes are having an effect.

  • Investigate suggestive symptoms

    When there is unexplained fatigue, right-sided abdominal discomfort, nausea or yellowing of the skin, ALT helps your doctor decide how urgently to look further.

When This Test Is Ordered

Reasons your doctor may request the Alanine Aminotransferase (ALT/SGPT) test

Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.

  • Routine liver screening

    • Routine health screening or an annual check-up that includes liver function.

  • Symptoms of liver strain

    • Fatigue, nausea, loss of appetite or discomfort under the right ribs.
    • Yellowing of the eyes or skin, or unusually dark urine.

  • Medication, known disease & family history

    • Starting or continuing a medicine known to affect the liver.
    • Known or suspected fatty liver disease, viral hepatitis, or regular alcohol use.
    • A family history of liver disease or of inherited iron overload.
Preparation
The short version
No prep needed.
  • Blood
  • Free home collection
  • No fasting
  • Results in 24 Hours
  1. 1
    Book any time

    No fasting window: pick any slot that suits you, online or on WhatsApp.

  2. 2
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    A DHA-licensed nurse collects your sample at home or in the office: free home collection.

  3. 3
    Results in 24 Hours

    A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.

Prep note
Physician reviewed

Fasting is not required for ALT on its own, though you may be asked to fast if it is bundled with a lipid or glucose panel: follow the instruction for the whole request.

Avoid strenuous exercise, especially heavy weight training, for a day or two beforehand, since muscle work can nudge transaminases upward. It is worth avoiding alcohol for a few days before the sample.

Bring a complete list of what you take, prescription and otherwise, including herbal remedies, protein powders and gym supplements, as several of these affect the liver. If ALT is being monitored over time, keeping the timing of your appointments consistent makes the trend easier to read.

Reading a High or Low Result

  • What a higher result can point to

    • Metabolic fatty liver disease, now the most frequent reason for a mildly raised ALT.
    • Viral hepatitis, either a new infection or a long-standing one flaring.
    • Medicines and supplements, including some pain relievers, statins, antibiotics, herbal products and bodybuilding preparations.
    • Alcohol, particularly a recent heavy episode or sustained regular drinking.
    • Autoimmune hepatitis, inherited iron overload, or Wilson disease in younger patients.
    • Coeliac disease or an underactive thyroid, both of which can raise transaminases without any liver-specific symptoms.

These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.

Limitations & Safety

What this test cannot tell you

  • ALT reflects that liver cells are leaking, not why, and gives no information about how much scarring is present.
  • A normal ALT does not exclude liver disease: established cirrhosis frequently runs with unremarkable enzyme results.
  • The value fluctuates with recent exercise, alcohol and intercurrent illness, so a single reading is rarely acted on alone.
  • A low result carries no recognised clinical meaning and is not investigated.

Risks of the blood draw

  • Mild bruising or brief soreness where the needle went in.
  • Occasional lightheadedness, which settles after a few minutes of rest.
  • Bleeding or infection at the site, which is rare with sterile single-use equipment.
Key Points
  • 1ALT sits mainly inside liver cells, so it is the more liver-specific of the two transaminases.
  • 2It is a sensitive early marker and often rises before any symptom appears.
  • 3Its value comes from repeated measurements and from how it compares with AST and the bile duct enzymes.
  • 4A normal result does not rule out advanced liver disease.
  • 5Supplements and over-the-counter products are a genuinely common cause and are worth mentioning to your doctor.
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Frequently Asked Questions

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Usually not. ALT indicates that liver cells are currently irritated, and the liver has a strong capacity to recover once the cause is removed. Many elevations settle after stopping a medicine, cutting alcohol, or improving weight and blood sugar.